Rewterz Threat Alert – Chaos Ransomware – Active IOCs

Severity

High

Analysis Summary

Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET version of Ryuk despite sharing no such overlaps with the notorious counterpart. Since then, it has undergone active development and quick advancements, which have persuaded several attacker groups to adopt it. The most recent version, known as Yashma, was observed in the wild in May 2022. Yashma allows attackers to configure the ransomware so that it does not execute dependent on the language chosen on the victim’s device. It can also disable antivirus software, backup services, storage services, remote desktop services, and credential vault services on victims’ machines. Malware developers frequently employ this strategy to avoid infecting computers in their own region, which would draw the attention of local law authorities. The Chaos ransomware generator is said to still lack some of the capabilities that are seen in many existing ransomware families.

Impact

• File Encryption

Indicators of Compromise

MD5

• ffdefa247d3bb4429558e8b334f4f2ae
• defde8c571e212be41be2c252611cb5e
• 69a8db82f9da6303e5ca6fe7a07acbcb

SHA-256

• 542c157186bae766dd3e2df424e9c25251d71086b99cc9df121bc9bf50462688
• 662704790ba57db166be625d0ad9102f44fa30f0a6608ff33ed76355e9ebc4db
• 7301c4c8728f9db28887657f361a19219451fa78fc7b524a5f86c805587e56e3

SHA-1

• af9f3af31889b55552a5721244184d0a115be74c
• 12a5b57226b659f4669944b1b09d05cd6357f2f6
• 94edcbd01e8f5c5ee2d0401cd4c5e801235bc29e

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have
• access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them
• regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.